Project Zomboid is worth looking at. It’s not my kind of game, but it’s great at what it is (top down zombie survival crafring)

Minecraft, Veloren, Valheim, Core Keeper

There’s always Valheim…

But I host Titanfall servers. People are able to play on them using the Northstar client, a mod for the game that lets you connect to community servers, as well as mod the game in general.

I’ve not played it in years, but Soldat was always great fun. Server requirements are pretty much: potato.